nios2: convert altera sysid to driver model

Convert altera sysid to driver model with misc uclass.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Chin Liang See <clsee@altera.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/nios2/dts/3c120_devboard.dts b/arch/nios2/dts/3c120_devboard.dts
index 4a34ce5..a3cfacb 100644
--- a/arch/nios2/dts/3c120_devboard.dts
+++ b/arch/nios2/dts/3c120_devboard.dts
@@ -71,6 +71,7 @@
 				<0x00004cc0 0x08004cc0 0x00000010>,
 				<0x00004ce0 0x08004ce0 0x00000010>,
 				<0x00004d00 0x08004d00 0x00000010>,
+				<0x00004d40 0x08004d40 0x00000008>,
 				<0x00004d50 0x08004d50 0x00000008>,
 				<0x00008000 0x08008000 0x00000020>,
 				<0x00400000 0x08400000 0x00000020>;
@@ -91,6 +92,11 @@
 				clock-frequency = < 125000000 >;
 			};
 
+			sysid: sysid@0x4d40 {
+				compatible = "altr,sysid-1.0";
+				reg = <0x00004d40 0x00000008>;
+			};
+
 			jtag_uart: serial@0x4d50 {
 				compatible = "altr,juart-1.0";
 				reg = <0x00004d50 0x00000008>;